Sid Meier's Ace Patrol is available on the App Store, and it provides a refreshingly different sort of challenge for strategy fans. You'll have to take cautious control of your airborne World War I forces to thwart the enemy – and we've put some tips together to help you do just that.

-If you're presented with a series of green firing options, don't automatically take the one Ace Patrol decided is best (marked with a target icon). Only you know the objectives of the game you're playing, and sometimes it's worth getting a smaller shot if it improves your maneuverability for the next turn. Always think a few moves ahead, and execute your strategy accordingly.

-Do not be lured into the red areas of the map, as you'll take heavy fire from any surface-to-air defenses. With that said, you can lure the opponent into your own territory – two of your planes can be used effectively to steer the fight in a favorable direction.

-Be very wary when taking on rear-gunning aircraft, as these may cause calamity on the battlefield. Bombers, reconnaissance planes, and two-seater fighters all have rear-gunners. These units are best attacked from below or from behind, with all of the firepower you can muster.

-If you want to earn more points in the game, you can adjust the difficulty setting before heading into a mission. The challenge will be considerably harder and the mission may take longer, so choose the difficulty level that works best for you.

-As a general rule, it's best to fire on planes from behind, as this makes it difficult for them to turn and counter-attack, and also puts them squarely in your targets. For that reason, it's worth making your combat approaches in wide tactical arcs, using more than one unit if necessary to make sure the enemy is perfectly trapped for an assault.

-Note that different sorts of damage will impair aircraft in different ways. Should a plane's engine catch fire, a certain amount of damage will automatically be inflicted upon it during each turn. Wing damage may cause limited maneuvering options – pay attention to the messages received during combat so you can adjust your strategy accordingly.

-Don't forget to use cloud cover if you're close to crashing out and you need some safety. While you're in a cloud, enemies can't see or fire upon you, although you'll be restricted to basic maneuvers only. Note that enemies can also hide in cloud cover, so make sure you take them down before they can hide themselves safely away.

-Confused about altitude? You're not alone. As a general rule, being higher in the sky is more advantageous than being lower, as you'll have more special options on the table. There are three altitude heights in total, and unless you're in an engagement, it pays to climb higher if you can.

-Missions are split into two different categories in the game – offensive (marked red on the map), and defensive (marked blue). In order to achieve a Decisive Victory in a campaign, you’ll need to achieve seven mission victories.